private CommandStream.PipelineInstruction QueueOrCreateDataConection(CommandStream.PipelineEntry entry, ResponseDescription response, bool timeout, ref Stream stream, out bool isSocketReady)
{
CommandStream.PipelineInstruction instruction2;
isSocketReady = false;
if (this.m_DataHandshakeStarted)
{
isSocketReady = true;
return(CommandStream.PipelineInstruction.Pause);
}
this.m_DataHandshakeStarted = true;
bool flag = false;
int port = -1;
if ((entry.Command == "PASV\r\n") || (entry.Command == "EPSV\r\n"))
{
if (!response.PositiveCompletion)
{
base.m_AbortReason = SR.GetString("net_ftp_server_failed_passive", new object[] { response.Status });
return(CommandStream.PipelineInstruction.Abort);
}
if (entry.Command == "PASV\r\n")
{
port = this.GetPortV4(response.StatusDescription);
}
else
{
port = this.GetPortV6(response.StatusDescription);
}
flag = true;
}
new SocketPermission(PermissionState.Unrestricted).Assert();
try
{
CommandStream.PipelineInstruction pause;
if (flag)
{
try
{
this.m_DataSocket = this.CreateFtpDataSocket((FtpWebRequest)base.m_Request, base.Socket);
}
catch (ObjectDisposedException)
{
throw ExceptionHelper.RequestAbortedException;
}
this.m_PassiveEndPoint = new IPEndPoint(base.ServerAddress, port);
}
if (this.m_PassiveEndPoint != null)
{
IPEndPoint passiveEndPoint = this.m_PassiveEndPoint;
this.m_PassiveEndPoint = null;
if (base.m_Async)
{
this.m_DataSocket.BeginConnect(passiveEndPoint, m_ConnectCallbackDelegate, this);
pause = CommandStream.PipelineInstruction.Pause;
}
else
{
this.m_DataSocket.Connect(passiveEndPoint);
pause = CommandStream.PipelineInstruction.Advance;
}
}
else if (base.m_Async)
{
this.m_DataSocket.BeginAccept(m_AcceptCallbackDelegate, this);
pause = CommandStream.PipelineInstruction.Pause;
}
else
{
Socket dataSocket = this.m_DataSocket;
try
{
this.m_DataSocket = this.m_DataSocket.Accept();
if (!base.ServerAddress.Equals(((IPEndPoint)this.m_DataSocket.RemoteEndPoint).Address))
{
this.m_DataSocket.Close();
throw new WebException(SR.GetString("net_ftp_active_address_different"), WebExceptionStatus.ProtocolError);
}
isSocketReady = true;
pause = CommandStream.PipelineInstruction.Pause;
}
finally
{
dataSocket.Close();
}
}
instruction2 = pause;
}
finally
{
CodeAccessPermission.RevertAssert();
}
return(instruction2);
}
protected override CommandStream.PipelineInstruction PipelineCallback(CommandStream.PipelineEntry entry, ResponseDescription response, bool timeout, ref Stream stream)
{
if (response == null)
{
return(CommandStream.PipelineInstruction.Abort);
}
FtpStatusCode status = (FtpStatusCode)response.Status;
if (status != FtpStatusCode.ClosingControl)
{
this.StatusCode = status;
this.StatusLine = response.StatusDescription;
}
if (response.InvalidStatusCode)
{
throw new WebException(SR.GetString("net_InvalidStatusCode"), WebExceptionStatus.ProtocolError);
}
if (base.m_Index == -1)
{
switch (status)
{
case FtpStatusCode.SendUserCommand:
this.m_BannerMessage = new StringBuilder();
this.m_BannerMessage.Append(this.StatusLine);
return(CommandStream.PipelineInstruction.Advance);
case FtpStatusCode.ServiceTemporarilyNotAvailable:
return(CommandStream.PipelineInstruction.Reread);
}
throw base.GenerateException(status, response.StatusDescription, null);
}
if (entry.Command == "OPTS utf8 on\r\n")
{
if (response.PositiveCompletion)
{
base.Encoding = Encoding.UTF8;
}
else
{
base.Encoding = Encoding.Default;
}
return(CommandStream.PipelineInstruction.Advance);
}
if (entry.Command.IndexOf("USER") != -1)
{
if (status == FtpStatusCode.LoggedInProceed)
{
this.m_LoginState = FtpLoginState.LoggedIn;
base.m_Index++;
}
else if ((status == FtpStatusCode.NotLoggedIn) && (this.m_LoginState != FtpLoginState.NotLoggedIn))
{
this.m_LoginState = FtpLoginState.ReloginFailed;
throw ExceptionHelper.IsolatedException;
}
}
if (response.TransientFailure || response.PermanentFailure)
{
if (status == FtpStatusCode.ServiceNotAvailable)
{
base.MarkAsRecoverableFailure();
}
throw base.GenerateException(status, response.StatusDescription, null);
}
if ((this.m_LoginState != FtpLoginState.LoggedIn) && (entry.Command.IndexOf("PASS") != -1))
{
switch (status)
{
case FtpStatusCode.NeedLoginAccount:
case FtpStatusCode.LoggedInProceed:
this.m_LoginState = FtpLoginState.LoggedIn;
goto Label_017A;
}
throw base.GenerateException(status, response.StatusDescription, null);
}
Label_017A:
if (entry.HasFlag(CommandStream.PipelineEntryFlags.CreateDataConnection) && (response.PositiveCompletion || response.PositiveIntermediate))
{
bool flag;
CommandStream.PipelineInstruction instruction = this.QueueOrCreateDataConection(entry, response, timeout, ref stream, out flag);
if (!flag)
{
return(instruction);
}
}
switch (status)
{
case FtpStatusCode.OpeningData:
case FtpStatusCode.DataAlreadyOpen:
{
if (this.m_DataSocket == null)
{
return(CommandStream.PipelineInstruction.Abort);
}
if (!entry.HasFlag(CommandStream.PipelineEntryFlags.GiveDataStream))
{
base.m_AbortReason = SR.GetString("net_ftp_invalid_status_response", new object[] { status, entry.Command });
return(CommandStream.PipelineInstruction.Abort);
}
this.TryUpdateContentLength(response.StatusDescription);
FtpWebRequest request = (FtpWebRequest)base.m_Request;
if (request.MethodInfo.ShouldParseForResponseUri)
{
this.TryUpdateResponseUri(response.StatusDescription, request);
}
return(this.QueueOrCreateFtpDataStream(ref stream));
}
case FtpStatusCode.LoggedInProceed:
this.m_WelcomeMessage.Append(this.StatusLine);
break;
case FtpStatusCode.ClosingControl:
this.m_ExitMessage.Append(response.StatusDescription);
base.CloseSocket();
break;
case FtpStatusCode.ServerWantsSecureSession:
{
FtpWebRequest initiatingRequest = (FtpWebRequest)base.m_Request;
TlsStream stream2 = new TlsStream(initiatingRequest.RequestUri.Host, base.NetworkStream, initiatingRequest.ClientCertificates, base.Pool.ServicePoint, initiatingRequest, base.m_Async ? initiatingRequest.GetWritingContext().ContextCopy : null);
base.NetworkStream = stream2;
break;
}
case FtpStatusCode.FileStatus:
{
FtpWebRequest request1 = (FtpWebRequest)base.m_Request;
if (entry.Command.StartsWith("SIZE "))
{
this.m_ContentLength = this.GetContentLengthFrom213Response(response.StatusDescription);
}
else if (entry.Command.StartsWith("MDTM "))
{
this.m_LastModified = this.GetLastModifiedFrom213Response(response.StatusDescription);
}
break;
}
default:
if (status == FtpStatusCode.PathnameCreated)
{
if ((entry.Command == "PWD\r\n") && !entry.HasFlag(CommandStream.PipelineEntryFlags.UserCommand))
{
this.m_LoginDirectory = this.GetLoginDirectory(response.StatusDescription);
}
}
else if (entry.Command.IndexOf("CWD") != -1)
{
this.m_EstablishedServerDirectory = this.m_RequestedServerDirectory;
}
break;
}
if (!response.PositiveIntermediate && (base.UsingSecureStream || !(entry.Command == "AUTH TLS\r\n")))
{
return(CommandStream.PipelineInstruction.Advance);
}
return(CommandStream.PipelineInstruction.Reread);
}